Yeah. For instance, my nephew is only 5, but when he was allowed to watch Sponge Bob (I hate this ignorant dribble, but I respect it's right to be on TV...or at least in existence) and he started hitting kids and us, and so he was no longer allowed to watch it, everything was explained to him, and now he's fine.
Point is, if you don't pay attention or watch what your kids are doing, then they're not gonna know the difference. I must have been shelter or something, cause I wasn't even allowed to watch Gumby cause my mom thought it was too stupid for us. She always knew what we were doing, so we didn't get into much trouble. And we made it through High School without killing anyone! Shock! It's not hard to know what your kids are doing, so long as you actually pay attention to them. Most parents are too lazy, don't know how to parent, or are preoccupied by unimportant stuff now.
*I'm not saying anyone's parents here are like that, I'm just saying, if someone's concerned about what their kid is watching, they need to be in the know. It's not hard to find out.